Federation Cleanup (1) doc: clean some outdate redirects and its associated content. (#19572)

* doc: clean some outdate redirects and its associated content.

* doc: also cleanup tasks.yml content.

content/en/docs/concepts/services-networking/connect-applications-service.md

@@ -419,13 +419,3 @@ LoadBalancer Ingress:   a320587ffd19711e5a37606cf4a74574-1142138393.us-east-1.el
 ```
 
 {{% /capture %}}
-
-{{% capture whatsnext %}}
-
-Kubernetes also supports Federated Services, which can span multiple
-clusters and cloud providers, to provide increased availability,
-better fault tolerance and greater scalability for your services. See
-the [Federated Services User Guide](/docs/concepts/cluster-administration/federation-service-discovery/)
-for further information.
-
-{{% /capture %}}

content/en/docs/contribute/style/content-organization.md

@@ -107,7 +107,6 @@ Another widely used example is the `includes` bundle. It sets `headless: true` i
 ```bash
 en/includes
 ├── default-storage-class-prereqs.md
-├── federated-task-tutorial-prereqs.md
 ├── index.md
 ├── partner-script.js
 ├── partner-style.css

content/en/includes/federated-task-tutorial-prereqs.md

@@ -1,5 +0,0 @@
-This guide assumes that you have a running Kubernetes Cluster Federation installation. 
-If not, then head over to the [federation admin guide](/docs/tutorials/federation/set-up-cluster-federation-kubefed/) to learn how to
-bring up a cluster federation (or have your cluster administrator do this for you).
-Other tutorials, such as Kelsey Hightower's [Federated Kubernetes Tutorial](https://github.com/kelseyhightower/kubernetes-cluster-federation),
-might also help you create a Federated Kubernetes cluster.